A multibillion-dollar expansion of the Panama Canal is proving a boon to scientists. The construction has revealed a trove of fossils, revealing a wide array of creatures that lived at the southern end of North America 20 millions years ago.

A multibillion-dollar expansion of the Panama Canal is proving a boon to scientists. The construction has revealed a trove of fossils, revealing a wide array of creatures that lived at the southern end of North America 20 millions years ago.